AirHint found the following cheapest return flights from Singapore (SIN) to Kathmandu (KTM) in September 2025 (see full year).

Return flights

08 Sep - 14 Sep	IndiGo
17 Sep - 22 Sep	Scoot
06 Sep - 15 Sep	SriLankan Airlines
05 Sep - 16 Sep	IndiGo
29 Sep - 06 Oct	Thai Lion Air
22 Sep - 30 Sep	Scoot
24 Sep - 05 Oct	Thai AirAsia
12 Sep - 17 Sep	IndiGo
19 Sep - 22 Sep	Air India
15 Sep - 20 Sep	Air India
26 Sep - 11 Oct	Thai AirAsia
22 Sep - 26 Sep	Thai AirAsia
30 Sep - 11 Oct	Air India
22 Sep - 29 Sep	Thai AirAsia
30 Sep - 12 Oct	Air India
29 Sep - 11 Oct	Air India
27 Sep - 06 Oct	IndiGo
26 Sep - 02 Oct	Thai AirAsia
27 Sep - 05 Oct	IndiGo
26 Sep - 05 Oct	Thai AirAsia

Also check the deals for one-way flights from Singapore to Kathmandu in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Singapore to Kathmandu in September from 301€

Return flights